iPhone and Android App that supports Toodledo and subtasks

I am trying out Toodledo Pro (7 day trial) and I like what I see so far. Like many I have adopted the GTD structure that Proximo uses. This setup requires the use of sub-tasks.

The problem I having is that I use both Android and iOS. I use an Android Phone because Verizon is the only reliable carrier in my area and I also use an iPod Touch and iPad.

When looking at various apps I find that sub-tasks seems to be something that is not supported. Perhaps what I need to do is stop creating tasks that represent projects and just use folders as project. This makes it difficult to view a list of projects however.

Has anyone else run up against this issue? Can anyone suggest an iOS app and an Android app that both sync with Toodledo and support sub-tasks?